In acertain region of the country if is known from past experience that the probability of selecting an adult over 40 years old age with cancer 0.05 . If the probability of adoctor diagnosing aperson with cancer having the diases is 0.78 and the probability of incorrectly diagnosing aperson without cancer as having the dieses is 0.06:

1-what is the probability that aperson diagnised having acancer

2-what is the probability as having acancer actually has adieses.

thanks alot

November 16th 2009, 06:45 PM

mr fantastic

Quote:

Originally Posted by john12345

Question:

In acertain region of the country if is known from past experience that the probability of selecting an adult over 40 years old age with cancer 0.05 . If the probability of adoctor diagnosing aperson with cancer having the diases is 0.78 and the probability of incorrectly diagnosing aperson without cancer as having the dieses is 0.06:

1-what is the probability that aperson diagnised having acancer

2-what is the probability as having acancer actually has adieses.

thanks alot

Draw a tree diagram. The first two branches are C and C' (where C = has cancer). Then: